Forum Discussion
BrittanyN
Jan 09, 2026Copper Contributor
Classic Outlook Keeps "Not Responding" and freezing
Hi there, I tried to scour for something similar, but I couldn't find anything and/or it didn't work - so here I am - hopefully someone can help. Okay the facts - I use Classic Outlook (CO movi...
Jan 11, 2026
CO can be sluggish for a few reasons, here is my list to check:
Windows updates
Office updates
Size of PST files of the AOL POP
Size of OST file (for the 3 domained accounts)
Antivirus is a leading cause of sluggish CO
Firewalls
VPN
If you are still having problems, happy to try to help if you answer those questions.
Lisa