It must be me but using any Microsoft email program will allow ActiveX code in an infected email to run. IMHO just a total NONO.
If the lady liked OE then Thunderbird is almost a given; it's default screen layout is so much like OE that there shouldn't be a question - IMHO.
I have literally many hundreds of customer folders, emails stored since 1998, a total of 1.13GB size of all the mail folders. It is fast, reactive and stable.
From customers that use it I hear only good things about Lightning, Thunderbird's calendar extension.
Backup? One folder tree and you have it all, emails, address books, extensions, everything.
To the poster who remarked "I didn't know that Thunderbird was likely to be phased out":
You are mistaken, sorry. TB is being moved to "stable" state, that is there will be no further new functionality added.The original wording is along the lines of
[the leadership of the development team...] "has come to the conclusion that on-going stability is the most important thing, and that continued innovation in Thunderbird is not a priority for Mozilla’s product efforts"
WOW! Finally stability over feature mongering. More or less and with several name changes it's the same since Netscape Mail appeared in Netscape Navigator somewhere around 1997, that was before Win98! But now Thunderbird is in a totally different world as far as stability is concerned. I wish it a long life!
If you want all your sensitive communications with customers, suppliers, stores, banks and CC companies and so on to be out there "in the cloud" then go for it.
But doesn't the law require from us to be able to produce printed copy of emails if requested? How in the wold can you guarantee that for cloud storage over ten years? Across services that have in the past lost their customer's emails? Anybody remember the Hotmail outage from way before yesteryear?
Sorry, my remark almost became a rant. Hush...