Thanks in advance.. 

We are using Office 365 for our e-mails flow.

in our organization we are using window 7 on many machine.. on some machine we are using window 8.1

Skype for business is working very well on 8.1

but in window 7 we are not able to install the same. so we are decided to install Lync 2013 for window 7.

but after installation unfortunately we are not able to login in Lync 2013 on window 7.

"The server is temporarily unavailable. If the problem continues, Please contact your support team."

PLease help us.

Hi Naveen,

I don't think it's a right forum for this question... 

Please choose another forum to ask your question or try to troubleshoot yourself:
How to troubleshoot sign-in issues in Skype for Business Online

Hi

According your description there are my advice to you below:

1.Update the Lync client to the latest version that's available on the Downloads page of the Office 365 portal.

2.Update the Microsoft Online Services Sign-In Assistant to the latest version.

3.Clear your cached certificates, credentials and connections

4.Delete the Online personal certificate and then download a new one. Be aware that when the user clicks Save Password in Lync 2010, this action also saves the certificate in Windows Certificate Manager. 

Best regards

Allan