My Outlook 2010 is suddenly extremely slow when opening attachments, or adding attachments to a draft email. This began Wednesday, October 24th (I was out of the office prior to that date).

I narrowed down the issue to the Symantec Endpoint Protection Outlook Add In. When I disable it all handling of attachments is extremely fast. When I enable the add in, handling takes a long time (Outlook will hang for a minute or two before completing the action).

I'm not 100% sure what version of Symantec i'm using. I think it's the Small Business edition (we're a small office). Version number is 12.1.1101.401 (Release), RU1MP1.

How do I fix this? Thanks for any suggestions provided.