Has anyone tried migrating Exchange to the cloud WITHOUT updating to SP3 level, and how did it go?

We are about to migrate from Exchange 2010 on-prem, to Exchange Online.  We are reading that it is recommended to be at 2010 SP3 level before using the Exchange migration tool.  We are currently at 2010 SP2.  Two questions are

1) Has anyone tried migrating Exchange to the cloud WITHOUT updating to SP3 level, and how did it go?

2) For those who did update to SP3, how long did it take them - how long was the server down for?  We have a 200GB information store, so not too large.

Thanks for your help!
Damian GardnerIT AdminAsked:
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timgreen7077Exchange EngineerCommented:
I would suggest always using the supported and Microsoft recommended methods and service packs for migrations. this ensures a better migration experience because they add architectural changes that makes for better migration experiences.

Service pack updates normally took about 45 minutes to and hour. this can depend though on server resources and so forth so no one will be able to give you a definite answer on that.

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Hasin Ahmed ChoudharyExchange AdministratorCommented:
You are asking about downtime ,that means there is no availability. If the email requirement for business is critical then you should think of introducing new server and make DB redundant.
Damian GardnerIT AdminAuthor Commented:
Thank you for your replies so far.  I am asking for experiences, however - has anyone had an experience relating to this scenario?  I welcome any experiences relating to this exact scenario.

thank you!
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