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I would suggest a powershell script to check password age and send an email out to the users when it will expire in x number of days.
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Check this article to notify users via email when their passwords expire: <br />
<a href="http://expert-advice.org/2017/01/automate-password-change-notification-email/" rel="ugc">http://expert-advice.org/2017/01/automate-password-change-notification-email/</a><br />
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You can create a group where you apply the 90-day policy. First, query AD to get all users who have changed the password during the last 76 days. Then add them to the group. &nbsp;<br />
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Fine-Grained Password and Account Lockout Policy Step-by-Step Guide: <br />
<a href="https://technet.microsoft.com/en-us/library/cc770842(v=ws.10).aspx" rel="ugc">https://technet.microsoft.com/en-us/library/cc770842(v=ws.10).aspx</a><br />
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You may also get help from this <a href="https://www.lepide.com/lepideauditor/password-expiration-notification.html" rel="ugc">password expiration notifier</a> to automatically alert your users to change their passwords timely.<br />
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Hope this helps!
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You can allow users to use a webpart in sharepoint to change their passwords: <a href="http://glorix.blogspot.de/2007/10/ad-change-password-webpart.html" rel="ugc">http://glorix.blogspot.de/2007/10/ad-change-password-webpart.html</a>
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Using SharePoint 2013 standard on premise. In Active directory I selected the option for a user to change the password the next time they log on. However, the option in the Windows Security dialog box does not give this option. It keeps coming back of just entering the password again. Is there a setting I'm missing or need to change? I believe there is no mechanism for SharePoint 2013 to change password. Is there a web part out there for SharePoint 2013?
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I guess my linked code would work in 2013 - did you try it?
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I did find this: Password reset option in RD WebAccess on Windows Server 2012. But how do you set it up?
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I can create one. But what documentation is available to install this host?
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I would not setup an RD session host just for password changes, that is a very weird idea and also has licensing costs (RD CALs) to consider.<br />
You have not yet commented on the idea of using what I linked, a webpart for sharepoint that allows password changing within sharepoint.
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I'm looking at a third party web part that will do just fine and send out emails when the password is ready to expire. Thanks everyone.
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<div class="content wysiwyg-content">
Here is the situation:<br />
<br />
I have over 100 users who are remote from the corporate office who access SharePoint with an active directory account. There system is not at the corporate office they only access SharePoint through a browser. Their account is created by the IT department and sent to them via email. Once the account has reached 90 days the password needs to be changed. However, there is no prompt for them to change it. I believe that SharePoint doesn't provide this feature. What can be done or other options?
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Here is the situation:

I have over 100 users who are remote from the corporate office who access SharePoint with an active directory account. There system is not at the corporate office they only access SharePoint through a browser. Their account is created by the IT department and sent to them via email. Once the account has reached 90 days the password needs to be changed. However, there is no prompt for them to change it. I believe that SharePoint doesn't provide this feature. What can be done or other options?

Password changes using SharePoint

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.

Microsoft SharePoint

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.