Assistance for billing and subscription management issues is available online repair PST file without data loss or by telephone during China business hours (Beijing Time), Monday through Friday. Billing and subscription management support can be accessed using the same phone number and online service request process as with technical support. The support telephone number can be found on the Microsoft 365 operated by 21Vianet portal. 2 Severity A is only available to customers who signed an advanced online service agreement with 21Vianet through a sales account manager. For billing and subscription management support, the highest severity level is B. Presales support for Microsoft 365 operated by 21Vianet provides assistance on subscription features and benefits, plan comparisons, pricing and licensing, and helps to identify the right solution to meet your business needs.

For more self-help resources, see Microsoft 365 operated by 21Vianet.Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.Technical support for Microsoft 365 operated by 21Vianet subscriptions provides assistance with basic installation, setup, and general technical usage.Microsoft 365 Basic now comes with 100GB of cloud storage, secure photo and file storage, secure ad-free email, and technical support.
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In addition, presales support can help you find a Partner, and purchase and sign up for a trial. Presales support can be accessed using the same phone number as with technical support. Initial response time is based on the severity levels described in Technical support case handling.
Technical support case handling

Sign up for a free trial of Business Standard for up to 25 users and experience how Microsoft 365 empowers your business to get more done from anywhere and helps keep data safe with built-in security. Find and edit files, scan documents, and create content on the go with access to Copilot Chat, productivity apps, and more — all in one place. The type of support Microsoft provides for consumers depends on the product you're calling about and if you have a product&nbsp