Aug <var data-var='date'>12</var>, <var data-var='time'>02:30</var> PDT Completed - The scheduled maintenance has been completed. Aug <var data-var='date'>11</var>, <var data-var='time'>18:30</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jul <var data-var='date'>29</var>, <var data-var='time'>16:07</var> PDT Scheduled - Date: Tues, Aug 11, 2026 Time: 6:30 PM PT Aug 11 to 2:30 AM PT Aug 12 Duration: 8 hours Purpose: Routine Software Upgrade System Affected: Calix Service Cloud, Engagement Cloud, Operations Cloud, Deployment Cloud and Command IQ, US and Canada The Calix Cloud Operations team will be performing the 26.3 regular cadence upgrade for Service Cloud, Engagement Cloud, Operations Cloud, Deployment Cloud and Command IQ on CalixCloud.calix.com and CalixCloud-ca.calix.com. During this time all the applications and components being upgraded will be unavailable. We value your business and are available to help. We understand there is no ideal time to perform routine maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online from Calix My Checkpoint. To access Calix My Checkpoint, log in to <a href="https://community.calix.com/s/cases">My Checkpoint.</a> From here, you can submit a new technical support case or check/update the status of existing cases. Please note, US Engagement Cloud Lenses for the prior-month & prior-2-months may not be available until 3:30am PST. Thank you, Cloud Operations Calix Inc.

Calix 26.3 Cloud Upgrade

Aug <var data-var='date'> 9</var>, <var data-var='time'>00:15</var> PDT Completed - The Calix Cloud team would like to inform you that the previously scheduled infrastructure maintenance for Operations Cloud in the United States has been postponed and will not be performed during the planned maintenance window. Due to unforeseen circumstances, this maintenance activity has been deferred and will be rescheduled for a future date. As a result, no service impact is expected during the originally announced maintenance window, and all Calix Cloud services are expected to remain fully operational. We sincerely apologize for any inconvenience or disruption this change may cause. We understand that maintenance notifications are important for your planning and operations, and we regret any confusion resulting from this postponement. Our team is actively working to establish a new maintenance window and will provide advance notice once the updated schedule has been confirmed. We value your business and are available to help. We appreciate your patience, understanding, and continued support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc. Aug <var data-var='date'> 8</var>, <var data-var='time'>23:30</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Aug <var data-var='date'> 4</var>, <var data-var='time'>16:35</var> PDT Scheduled - Date: August 8, 2026 Scheduled Time: 11:30 PM PDT Duration: 4 hours The Calix Cloud team will be performing rescheduled infrastructure maintenance for Operations Cloud in the United States. During this maintenance period, portions of Calix Service Cloud, Operations Cloud, and CommandIQ may be impacted. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

Calix Cloud Infrastructure Maintenance - United States

Aug <var data-var='date'> 8</var>, <var data-var='time'>03:30</var> PDT Completed - The scheduled maintenance has been completed. Aug <var data-var='date'> 7</var>, <var data-var='time'>23:30</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Aug <var data-var='date'> 4</var>, <var data-var='time'>16:34</var> PDT Scheduled - Date: August 7, 2026 Scheduled Time: 11:30 PM PDT Duration: 4 hours The Calix Cloud team will be performing rescheduled infrastructure maintenance for Operations Cloud in the International region. During this maintenance period, portions of Calix Service Cloud, Operations Cloud, and CommandIQ may be impacted. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

Calix Cloud Infrastructure Maintenance - International

Jul <var data-var='date'>29</var>, <var data-var='time'>04:00</var> PDT Completed - The scheduled maintenance has been completed. Jul <var data-var='date'>29</var>, <var data-var='time'>00:00</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jul <var data-var='date'>21</var>, <var data-var='time'>21:20</var> PDT Scheduled - Date: July 29, 2026 Scheduled Time: 12:00 AM PDT Duration: 4 hours The Calix Cloud team will be performing infrastructure maintenance in the United States. During this maintenance period, portions of Calix Service Cloud, Operations Cloud, and CommandIQ may be impacted. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

Jul <var data-var='date'>27</var>, <var data-var='time'>04:00</var> PDT Completed - The scheduled maintenance has been completed. Jul <var data-var='date'>27</var>, <var data-var='time'>00:00</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jul <var data-var='date'>21</var>, <var data-var='time'>21:17</var> PDT Scheduled - Date: July 27, 2026 Scheduled Time: 12:00 AM PDT Duration: 4 hours The Calix Cloud team will be performing infrastructure maintenance in the International region. During this maintenance period, portions of Calix Service Cloud, Operations Cloud, and CommandIQ may be impacted. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

Jul <var data-var='date'>25</var>, <var data-var='time'>09:45</var> PDT Resolved - Customer Advisory – Cloud Service Outage Incident Start Time: 9:30 AM ET, July 24, 2026 Current Status: Resolved Latest Update Operations Cloud services have been successfully restored, and all core functionalities are now operating normally. The Health pipeline is fully operational, including customer-configured threshold processing. Recovery activities are complete at this stage. Any remaining data gaps or residual issues will be evaluated and addressed on a case-by-case basis to ensure minimal customer impact. Community post link; https://community.calix.com/s/feed/0D5Pm00002aJM42KAG What We’re Doing: The identified issue has been addressed through corrective actions, and systems have now recovered. This will be the final post for this incident. Jul <var data-var='date'>25</var>, <var data-var='time'>07:54</var> PDT Monitoring - Customer Advisory – Cloud Service Outage Incident Start Time: 9:30 AM ET, July 24, 2026 Current Status: Monitoring Latest Update Operations Cloud services have been successfully restored. The health pipeline is fully operational, including customer-configured threshold processing. While historical health data generated during the outage window may be incomplete, current health monitoring and processing are functioning as expected. Recovery activities are largely complete at this stage. Any remaining data gaps or residual issues will be evaluated and addressed on a case-by-case basis to ensure minimal customer impact. What We’re Doing: The identified issue has been addressed through corrective actions, and systems are currently recovering. Barring any recurrence, this incident will be resolved in the next 1 hour. Jul <var data-var='date'>25</var>, <var data-var='time'>04:33</var> PDT Update - Customer Advisory – Cloud Service Outage Incident Start Time: 9:30 AM ET, July 24, 2026 Current Status: Active Recovery Latest Update: All Operations Cloud features and capabilities have now been restored with the exception of Cloud Health data, where recovery remains in progress. While customers can access Operations Cloud functionality, some Cloud Health information may not yet be fully available as recovery efforts continue. Cloud Health data currently affected includes: >Port utilization and threshold violations >Packet error statistics >ONT health metrics >Network alarms and fault conditions >Optical power-related health alarms >Performance and status information for network interfaces and subscriber access infrastructure What We Are Doing The engineering team continues to actively work on restoring the remaining Cloud Health data and validating the integrity of recovered information. We are closely monitoring progress and will provide updates as additional information becomes available. Jul <var data-var='date'>25</var>, <var data-var='time'>01:44</var> PDT Update - Customer Advisory – Cloud Service Outage Incident Start Time: 9:30 AM ET, July 24, 2026 Current Status: Active Recovery Latest Update Operations Cloud; Recovery is underway. 98% of systems have been restored, backlog alarms are being process, and service provisioning is now operational. Health recovery remains in progress. What We Are Doing The engineering team is working to resolve outstanding Operations Cloud issues overnight. We will monitor progress and keep you informed. We sincerely apologize for the disruption and appreciate your patience as recovery efforts continue. Jul <var data-var='date'>24</var>, <var data-var='time'>23:40</var> PDT Update - Customer Advisory – Cloud Service Outage Incident Start Time: 9:30 AM ET, July 24, 2026 Current Status: Active Recovery Latest Update Operations Cloud: Recovery is still in progress. Majority of systems are now synchronized, and the alarm system is in progress. What We Are Doing The engineering team is working to resolve outstanding Operations Cloud issues overnight. We will monitor progress and keep you informed. We sincerely apologize for the disruption and appreciate your patience as recovery efforts continue. Jul <var data-var='date'>24</var>, <var data-var='time'>22:08</var> PDT Update - Latest Update: Service Cloud During recovery validation, we identified a network-related issue in our Google infrastructure that impacted the ACS/TR-069 communications within Service Cloud, which degraded on-discovery workflows. This issue is now resolved. All Service Cloud functions are now operational. Please note: if you manually onboarded or updated RGs – please pause / suspend the on-discovery workflow for 48 hours (to allow for check-in) Operations Cloud remains partially restored with approximately 40% of Operations Cloud services and capabilities have been recovered. Recovery efforts for the remaining services continue while teams work to resolve the newly identified Operation Cloud issue. Jul <var data-var='date'>24</var>, <var data-var='time'>13:26</var> PDT Update - We are currently investigating reports of overall slowness within CSC and intermittent failures. Our teams are actively working to identify the cause and assess the impact. Operations Cloud recovery efforts remain in progress, about 50% of AXOS devices have reconnected and are communicating with the platform again. Alarm data is starting to flow back into Operations Cloud, while recovery for the remaining devices is still in progress. Jul <var data-var='date'>24</var>, <var data-var='time'>11:51</var> PDT Update - CSC services, including device onboarding, are now operational and being actively monitored. End-to-end validation is still in progress. Newly onboarded devices may experience a short delay before appearing in search while indexing catches up. CCO recovery continues, so some ONT operations, alarms, health monitoring, service provisioning, and dependent notification flows may remain impacted until recovery is complete. Jul <var data-var='date'>24</var>, <var data-var='time'>10:41</var> PDT Update - Most CSC services, including device onboarding, are now operational. Validation of all service flows is still in progress. Recovery efforts for CCO continue, and some ONT-related operations, alarms, and health monitoring features are still being restored Jul <var data-var='date'>24</var>, <var data-var='time'>09:37</var> PDT Update - Recovery efforts are still in progress. The engineering team has identified the issue and is actively working to restore services for affected customers. Jul <var data-var='date'>24</var>, <var data-var='time'>08:28</var> PDT Identified - Recovery efforts are currently in progress. The engineering team has identified the issue and is actively working to restore services for affected customers. Jul <var data-var='date'>24</var>, <var data-var='time'>07:40</var> PDT Update - We are continuing to investigate this issue. Jul <var data-var='date'>24</var>, <var data-var='time'>07:30</var> PDT Investigating - We are currently investigating reports of issues with Inability to remotely provision, configure, or manage subscriber devices in Service Cloud, Deployment Cloud and Operations Cloud. Additional details and regular status updates regarding this matter can be found on the Calix Community at the following link: https://community.calix.com/s/feed/0D5Pm00002aJM42KAG

CLOUD INCIDENT | CI-26-39 | MULTI-CUSTOMER IMPACT

Jul <var data-var='date'>22</var>, <var data-var='time'>00:30</var> PDT Completed - The scheduled maintenance has been completed. Jul <var data-var='date'>21</var>, <var data-var='time'>20:30</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jul <var data-var='date'>15</var>, <var data-var='time'>08:31</var> PDT Scheduled - Date: July 21, 2026 Scheduled Time: 8:30 PM PDT Duration: 4 hours The Calix Cloud team will be performing infrastructure maintenance in the United States. Please reference the following <a href="https://community.calix.com/s/feed/0D5Pm00002X32pMKAR">Community post</a> for more information. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

Jul <var data-var='date'>16</var>, <var data-var='time'>00:30</var> PDT Completed - The scheduled maintenance has been completed. Jul <var data-var='date'>15</var>, <var data-var='time'>20:30</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jul <var data-var='date'> 9</var>, <var data-var='time'>14:07</var> PDT Scheduled - Date: July 15, 2026 Scheduled Time: 8:30 PM PDT Duration: 4 hours The Calix Cloud team will be performing infrastructure maintenance in the International region. During the maintenance period, there may be an impact to real time reports. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

Jul <var data-var='date'> 8</var>, <var data-var='time'>01:30</var> PDT Completed - The scheduled maintenance has been completed. Jul <var data-var='date'> 7</var>, <var data-var='time'>19:30</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jun <var data-var='date'>25</var>, <var data-var='time'>14:36</var> PDT Scheduled - Date: July 7, 2026 Scheduled Time: 7:30 PM PDT Duration: 6 hours The Calix Cloud team will be performing infrastructure maintenance for Operations Cloud in the United States. During the maintenance window, Operations Cloud may be unavailable. All connected devices will automatically reconnect and sync once the maintenance is complete. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

Jul <var data-var='date'> 4</var>, <var data-var='time'>00:30</var> PDT Completed - The scheduled maintenance has been completed. Jul <var data-var='date'> 3</var>, <var data-var='time'>21:30</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jul <var data-var='date'> 2</var>, <var data-var='time'>11:14</var> PDT Scheduled - Date: July 3, 2026 Scheduled Time: 9:30 PM PDT Duration: 3 hours The Calix Cloud team will be performing infrastructure maintenance for Operations Cloud in the International region. During the maintenance window, there will be loss of alarm functionality. Upon completion, the alarms raised during the window will be processed. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

Jul <var data-var='date'> 1</var>, <var data-var='time'>00:30</var> PDT Completed - The scheduled maintenance has been completed. Jun <var data-var='date'>30</var>, <var data-var='time'>20:30</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jun <var data-var='date'>25</var>, <var data-var='time'>13:36</var> PDT Scheduled - Date: June 30, 2026 Scheduled Time: 8:30 PM PDT Duration: 4.0 hours The Calix Cloud team will be performing infrastructure maintenance for Operations Cloud in the International region. During the maintenance window, Operations Cloud may be unavailable. All connected devices will automatically reconnect and sync once the maintenance is complete. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

Jun <var data-var='date'>13</var>, <var data-var='time'>00:30</var> PDT Completed - The scheduled maintenance has been completed. Jun <var data-var='date'>12</var>, <var data-var='time'>21:00</var> PDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jun <var data-var='date'> 5</var>, <var data-var='time'>14:48</var> PDT Scheduled - Date: June 12, 2026 Scheduled Time: 9:00 PM PDT Duration: 3.5 hours The Calix Cloud team will be performing infrastructure maintenance for Operations Cloud in the US region. During the maintenance window, there will be loss of alarm functionality. Upon completion, the alarms raised during the window will be processed. We value your business and are available to help. We understand there is no ideal time to perform maintenance and thank you for your understanding and support. If you have any issues or questions concerning this notice, please create a technical support case online in the <a href="https://community.calix.com/s/cases">My Checkpoint portal.</a> Thank you, Cloud Operations Calix Inc.

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Calix Cloud Infrastructure Maintenance - United States

Calix Cloud Infrastructure Maintenance - International

CLOUD INCIDENT | CI-26-39 | MULTI-CUSTOMER IMPACT