office 365 o365 plan question - litigation hold / archiving?

I know just enough to be dangerous.  A potential client is looking to move from in house exchange on sbs 2011 to o365.  They are a tiny (3 mailbox) law firm.

There's a feature in 0365 that archives / keeps mail even after being deleted, right?  What is the officlal name for that and what plan(s) have it?

Is that 'litigation hold'?  And it's only on the E3 plan?

I saw some pages about how to turn on / off hold.  This is something you'd do on day 1 - start archiving all the mail?
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Vasil Michev (MVP)Commented:
Yes, Litigation hold, or Legal hold. The In-place Hold is a similar functionality that you can use to achieve the same purpose, but it again requires E3. And yes, you need to activate it ASAP, as it will not apply retroactively to messages that might have been deleted in the past. There's a lot of info around this on TechNet, for example start here:

If your clients only needs email, you can go with the standalone (thus cheaper) Exchange Online Plan 2. The 'smaller' plan, Exchange Online plan 1 does not offer this functionality.
BeGentleWithMe-INeedHelpAuthor Commented:
thanks.  Litigation hold = legal hold = archiving ??

and E3 has online plan 2 as part of it?

You are an mvp.  You use o365? do you deal direct with Microsoft or a syndicate partner like appriver?

do you do backups of o365 beyond what microsoft says they do (do they actually say they back up the data?).  What do you use?

want me to make these seperate questions, please let me know : )

Vasil Michev (MVP)Commented:
Archiving is different than Litigation hold. It will NOT guarantee that messages will be recoverable.

E3 has EO plan 2 as part of it, yes. For the backup read here:

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David Johnson, CD, MVPOwnerCommented:
Litigation hold != Archiving.  You can change / delete items in an archive but not in a litigation hold. Items can be added to either i.e. new received mail / sent mail
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