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Exchange Online Mailbox Size
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Mailbox Size is a simple utility that reports the size of your Microsoft Online
mailboxes. A common complaint that customers of Microsoft Online have is that
they don't know big each user's mailbox is. Mailbox Size solves that problem by
providing a command line utility which can be used to query mailbox size.
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Mailbox Size is fairly simple program that supports a few different command line arguments as shown
below.

Options:

s Supress Console Output
w Wait for key press before exiting
o Overwrite output file if exists
x Stop if a mailbox error occurs
g Write "ERROR" and the console output to output file if a mailbox error occurs
(implies x)
e Write erroronous data sets to the output file
z Delete output file before binding
v Verbose logging

usage:
GetInboxSize <Options> <Url> <User> <Pass> <Domain> <input file path> <output file path>

Example:
GetInboxSize "vewo" "https://server1/ews/exchange.asmx" "test@domain.com" "mypass" "" "C:\in.csv"
"C:\out.csv"

The input file must contain the email addresses of the mailboxes you wish to query. The account used to
query the mailbox size must have Admin rights within Microsoft Online.

The output is simply a CSV file which looks similar to the following. It can also contain Display Name if it
was specified in the input file.

Email Address,size,numitems
chad.mosman@messageops.com,37815055,605
info@messageops.com,9924,3

Mailbox Size Options