We have a user that is running Windows XP SP3 and Office 2007 Standard SP2. When they receive an email that requests a read receipt be sent to the sender opening the email freezes Outlook for 20-30 seconds before the pop up asking for the receipt to be sent appears. There is also this lag when read receipts are set to be sent automatically.
I have completely updated his OS and Office install, ran a repair, disabled add-ins, turned off the to-do bar. Nothing seems to make a difference.
Please advise as to what could be causing this and how it could be fixed. Thanks!