Hi there,

I have a problem with exchange apps. I want to add new app to my company exchange but I got an error which is "Office Store is not available". I tried to download some other apps but I see following error again.

I am using Exchange 2013 SP1 .

I recommend that you post this in the Development Forum:  http://social.technet.microsoft.com/Forums/en-US/exchangesvrdevelopment/threads

Hi,

According your post, I notice that you cannot add app for Exchange 2013 with error Office Store isn't available or is offline.
If I misunderstand your concern, please do not hesitate to let me know.

How about add app from a URL or file location? We can try to add app for Outlook client or Word for testing: https://store.office.com/appshome.aspx?legRedir=true&CorrelationId=83275012-a3a9-4bee-b761-96e1e38c957d&ui=pt-BR&rs=pt-BR&ad=BR&productgroup=Outlook

Access to the Office Store isnt supported for mailboxes or organizations in specific regions. For more information, we need contact service provider to double confirm.
More details about Install or remove apps for Outlook for your organization, please refer to: https://technet.microsoft.com/en-us/library/jj943752(v=exchg.150).aspx