Bandwidth question for VoIP / Office 365

Greetings. Just a quick bandwidth question.

We have 40Mb/s up/down connection now.  We'll be migrating to Office 365 in the near future (from on-premises Exchange 2010 SP3) and then VoIP a couple months later.

We have about 75 users in our office.  Most have mailboxes between 1GB and 4GB in size.

We are considering upgrading our bandwidth (fiber will be available in our building in the near future).

Is our current 40Mb/s pipe sufficient enough in the short term to support both Office 365 and a VoIP system ?

Thanks much.
-Stephen
lapavoniAsked:
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Vasil Michev (MVP)Commented:
Review this article and the references therein: http://technet.microsoft.com/library/f97c2f06-0426-443d-8a16-d98abb0da252#EstimateBandwidthRequirements

There are some calculators you can use there. In addition, you can also check this article for detailed comparison: http://technet.microsoft.com/en-us/library/jj688118.aspx
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lapavoniAuthor Commented:
Some good resources. Thank you.
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