Because:
Your mailbox is over its size limit
Your mailbox is over its size limit
Your mailbox is over its size limit
Your mailbox is over its size limit
Your mailbox is over its size limit
Your mailbox is over its size limit
etc
( sporters I’m sincerely gratitude to you, Wed 2 Jul 2014, 16:09, 1 reply, 11 years ago)

where does this message appear? Nowhere

( Naked Ape call me Caitlyn, Wed 2 Jul 2014, 16:11, Reply)

Bottom left of Outlook

( sporters I’m sincerely gratitude to you, Wed 2 Jul 2014, 16:12, Reply)

next to the Items/uread counters?

( Naked Ape call me Caitlyn, Wed 2 Jul 2014, 16:13, Reply)

here:

( sporters I’m sincerely gratitude to you, Wed 2 Jul 2014, 16:16, Reply)

yeah i don't have that

( Naked Ape call me Caitlyn, Wed 2 Jul 2014, 16:17, Reply)

You must be using an ancient version then

( sporters I’m sincerely gratitude to you, Wed 2 Jul 2014, 16:20, Reply)

2010

( Naked Ape call me Caitlyn, Wed 2 Jul 2014, 16:24, Reply)

Right click where that is and pick
Quota Information - On
( sporters I’m sincerely gratitude to you, Wed 2 Jul 2014, 16:25, Reply)

Dunt werk

( Naked Ape call me Caitlyn, Wed 2 Jul 2014, 16:35, Reply)

My Outlook is also 2010 version and it does work

( sporters I’m sincerely gratitude to you, Wed 2 Jul 2014, 16:37, Reply)

also I have "cool" dark grey outlokk as well ;)

( Naked Ape call me Caitlyn, Wed 2 Jul 2014, 16:18, Reply)