Why do my Gmail and Comcast accounts have different message counts?

This could be due to several reasons:

Gmail stores the same email in multiple IMAP folders. For example, an email in Gmail's system is stored in "All Mail" and if you applied a label to that email it would appear in "All Mail" and "Label_Applied".

If a label has been applied, such as "Label_Applied" then ShuttleCloud won't include that specific email in the equivalent Comcast “All Mail” folder just “Label_Applied”.

Not adding the email to multiple folders will make the message count differ between systems.

Still having trouble with the import process or do you have a question that's not answered here? Feel free to submit a support request, and we'll get back to you ASAP.