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Outlook 2010 constantly updating cached messages
Hi all. I'm running Outlook 2010 on the same Windows 7 system I've been using for the past two years without any real problems. Several weeks ago I began having problems with Outlook. The program opens in my gmail inbox (IMAP) and updates cached messages without any apparent problem. But then when I click on an email, it takes several minutes to open the message. Sometimes longer. When I click on a different message it starts updating cached messages again. Sometimes it gets stuck. Sometimes it doesn't. It seems to be getting gradually worse. Since last weekend I haven't been able to send messages. They get stuck in my outbox. For a while the program wouldn't respond for several minutes. That hasn't happened for about a week.
Last month I installed a new mesh router/network. About six weeks ago I installed Kaspersky Total Security (I'd been using Avast for many years). Three weeks ago I installed ProTools with a new audio driver. Besides this, nothing has changed.
What I've attempted: disabled Kaspersky Outlook add-in. Repaired Outlook. Reinstalled Outlook.
I appreciate any help.