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I think you can always call them (see their site, some products have dedicated pages)<br />
However, you shall always have your licenses ready
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PS: what's the possible bug?
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Does anyone know how to report a possible bug to Microsoft if one doesn't have an existing support contract with Microsoft?
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Does anyone know how to report a possible bug to Microsoft if one doesn't have an existing support contract with Microsoft?

How to report a possible bug to Microsoft

Visual Basic is Microsoft’s event-driven programming language and integrated development environment (IDE) for its Component Object Model (COM) programming model. It is relatively easy to learn and use because of its graphical development features and BASIC heritage. It has been replaced with VB.NET, and is very similar to VBA (Visual Basic for Applications), the programming language for the Microsoft Office product line.