Forum Discussion

RVL's avatar
RVL
Copper Contributor
Oct 16, 2025

Issues with Office applications after latest updates

Following the latest (Office 365) updates, we encounter issues with Office applications in general and Outlook (Classic) specifically. Slow start-up that disables add-ins, app freezing, slow scrolling, ...
Tried adding RAM - even up to 40 GB ! - but no real improvement.
Only re-install of MS Office seems to have an effect in one case.
Is this a general issue caused by implementing Copilot into all those MS Office apps ?

microsoft 365 apps

1 Reply

  • Kidd_Ip's avatar
    Kidd_Ip
    MVP
    Oct 19, 2025

    I may related to many factors, would suggest to check on below:

     

    - Switch to New Outlook: If feasible, try using the New Outlook or Outlook Web App, they’re better optimized for Copilot.
    - Disable Copilot and test
    - Check for Add-in Conflicts: Disable non-essential add-ins to reduce startup load.
    - Monitor CPU Usage: Use Task Manager to identify spikes and isolate problematic processes.

Resources