I just ran into this issue yesterday after upgrading a customer to GP 2010. They had Outlook 2010 installed, and when clicking on the Send To option in the report window, whether they chose PDF or TXT, nothing would seem to happen. Ordinarily this would open a new message with the report attached as a pdf or txt file. In this case I found that every time I would click on the Send To button, it would actually create an empty message in the Outbox, with no email address in the To: field and no report attached, even though the subject line was filled out as if there was an attachment.
Needless to say this was driving the customer mad since this was a frequently used feature of GP. Luckily Microsoft support came through and indicated that they had seen this but only with GP 2010 and Office 2010, and that Cached Exchange Mode needed to be enabled. I checked and indeed, that setting was not enabled and once it was, the Send To function began working normally again.
To enable Cached Exchange Mode, go to the File menu in Outlook, choose the Account Settings button and then Account Settings again from the dropdown list.
Select your email account on the E-mail tab, and click on Change…
Mark the box to “Use Cached Exchange Mode”, then click on the Next button.
You’ll get a warning that you need to quit and restart Outlook for the change to take effect. Once you do, the Send To function should work normally again.