delay in mail coming into outlook

delay in mail coming into outlook

we are receiving emails on my this (prem@avanttax.com) email ID very late on my computer which we access  it under cloud(outlook). Some time almost an hour late.

While the same email I receive instantly when I access emails through my cell phone.

michael@avanttax.com is also experiencing same issue.
 
Can you help us out on fixing this.

Anand