Write a detailed overview of ExpertSlides, a powerful add-in for Microsoft PowerPoint. Begin by introducing ExpertSlides as a Microsoft partner product, seamlessly integrated into the PowerPoint add-in store, AppSource. Highlight its one-click installation feature, emphasizing its user-friendly nature.

Delve into the extensive range of slide templates offered by ExpertSlides, mentioning the availability of over 1000 professionally designed templates. Explain how these templates cater to a wide variety of presentation needs, making them suitable for self-employed professionals, corporate clients, non-profit organizations, and users in the educational sector.

Discuss the vast collection of visual assets that ExpertSlides provides. Include details about the 7 million stock images, 500,000 gifs, and over 60,000 icons, and how these resources enhance the visual appeal and effectiveness of presentations.

Focus on the customization capabilities of ExpertSlides. Describe how users can easily adapt the slides to fit their specific corporate identity or personal style, including features like one-click color changes, placeholder image replacement, and custom logo integration.

Shed light on the cloud storage and favorite sections of ExpertSlides. Explain how users benefit from the convenience of storing their own files, such as images, logos, and finished presentations, in the ExpertSlides cloud. Mention the favorites section for saving and reusing preferred slides, enhancing efficiency and personalization.

Detail the additional features of the ExpertSlides Pro version, emphasizing the expanded access to a greater number of slide templates, images, gifs, and icons.

Conclude by mentioning the dark mode feature, highlighting its importance for users who work in low-light environments or prefer a darker interface for reduced eye strain.

Your article should reflect ExpertSlides as an essential tool for anyone looking to create professional, visually appealing, and personalized presentations with ease and efficiency."