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I have used Thunderbird for many years, and importantly it includes all emails relating to customers/sales/support ectera and sometimes I need to search through these old emails. But it has got very slow, now when i compose a message ioften have to wait for the text appear. I'm using the latest version and I have trimmed the emails I can remove so I dont see a way to keep the information and make it perform okay.
My idea was to have two Thunderbird installs so I just fire this version with the old emails up when I need to, is that possible or has anyone got a better idea.