I don't know what you mean by archiving.

Hello,

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Thank you!

i have a screen shot for you. where do these go? how do I access them??

Are you using Thunderbird, or something else, for your webmail?

What that message means is the programs work files now have large empty areas and can be compressed to save on disk space. You can go ahead and do it.

moved to the Thunderbird support queue - witness the Thunderbird icon on the upper-right corner of the screenshot