Come get your Calculator Updates!

Today, we released updated versions of both the Exchange 2010 Server Role Requirements Calculator and the Exchange 2013 Server Role Requirements Calculator.

The Exchange 2010 version is an incremental update and only includes minor bug fixes. You can view what changes have been made, or download the update directly.

In addition to bug fixes, the Exchange 2013 version, on the other hand, includes new functionality.  In particular, the ability to define how many AutoReseed volumes you would like in your design and mailbox space modeling. You can view what changes have been made, or download the update directly.

Mailbox space modeling provides a visual graph that indicates the expected amount of time it will take to consume the send/receive prohibit quota assuming the message profile remains constant.  As you can see from the example below, if I start with a 2GB mailbox with a 200 message profile and allocate a 10GB quota (and assuming no deletes), I expect to consume that quota in roughly 22 months.  Hopefully, this feature will allow you to plan out storage allocation more appropriately moving forward.



As always, we welcome your feedback.

Ross Smith IV
Principal Program Manager
Office 365 Customer Experience

Comments (17)
  1. HeloCheck says:

    Thanks a lot for this indeed a welcome enhancement!


  2. Anon-1 says:

    The Exchange 2013 Server Role Requirements Calculator, has been really helpful for the Exchange Server (On-Premises) customers, Thank you.

  3. Ross, is this formula correct? (Weekly Generated Data (MB)), I am missing the # mailboxes multiplier.
    This is true for all tiers, resulting in identical graphs for tier 2+ avg mail size / profile differs.

  4. Thank you Ross for adding AutoReseed feature. It was long time due.

  5. Paul Newell says:

    This is a great enhancement – thanks!

  6. Anonymous says:

    Mailbox space modeling is cool new functionality!

  7. @Michel de Rooij – The graphs show you how long a mailbox will take to consume the quota. It sounds like you are interested in seeing how much space is consumed over time for the design as a whole?

  8. DavidR1 says:

    How to you calculate if all users are using Online mode instead of Cached mode? I understand this will increase server memory utilization, Disk utilization, and Network utilization. Just not sure how much more.

  9. My mistake, need coffee. I thought it was the trending line per tier (which essentially contains the same information). Per mailbox is better graph-wise, thanks!

  10. Constantino Tobio says:

    Is the assumption being made here in terms of storage growth that the user receiving 200 msgs/day deletes none of them and there are no retention policies in place? I get that user deletions are potentially impossible to estimate, but factoring in retention
    might be doable.

  11. Me says:

    amazing stuff

  12. Frank T says:

    That will be really helpful for planning in environments with virtualized or ‘just in time’ storage. Or for cases where you know you’ll be doing a hardware and storage refresh before you actually hit the quotas.

    The old calculator seemed to assume that all users immediately filled up their mailboxes on day 1, which led to crazy storage requirements for large and unlimited quota environments.

  13. Hunter Styles says:

    Nice addition, Ross. Very helpful. Thank you for continuing to provide this tool and for improving it with each new Exchange version.

  14. Bram Hendriks says:

    Mailbox space modeling is a cool new functionality!

  15. David says:

    Is there an implied guidance here as to how many Auto-Reseed disks are allocated per server? If not, is there some explicit gudance on how this should be evaluated?

  16. Ralf says:

    Hi Ross,

    still missing sizing/calculation guidance for archive mailboxes and OnlineMode clients.


  17. Henry Bosch says:

    Same question as DavidR1: Cached vs Online. Also, how to take into account public folders (accessed by whole company) and shared mailboxes?

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